includes/WatchedItemQueryService.php

   1 <?php
   2
   3 use Wikimedia\Rdbms\IDatabase;
   4 use MediaWiki\Linker\LinkTarget;
   5 use Wikimedia\Assert\Assert;
   6 use Wikimedia\Rdbms\LoadBalancer;
   7
   8 /**
   9  * Class performing complex database queries related to WatchedItems.
  10  *
  11  * @since 1.28
  12  *
  13  * @file
  14  * @ingroup Watchlist
  15  *
  16  * @license GNU GPL v2+
  17  */
  18 class WatchedItemQueryService {
  19
  20         const DIR_OLDER = 'older';
  21         const DIR_NEWER = 'newer';
  22
  23         const INCLUDE_FLAGS = 'flags';
  24         const INCLUDE_USER = 'user';
  25         const INCLUDE_USER_ID = 'userid';
  26         const INCLUDE_COMMENT = 'comment';
  27         const INCLUDE_PATROL_INFO = 'patrol';
  28         const INCLUDE_SIZES = 'sizes';
  29         const INCLUDE_LOG_INFO = 'loginfo';
  30
  31         // FILTER_* constants are part of public API (are used in ApiQueryWatchlist and
  32         // ApiQueryWatchlistRaw classes) and should not be changed.
  33         // Changing values of those constants will result in a breaking change in the API
  34         const FILTER_MINOR = 'minor';
  35         const FILTER_NOT_MINOR = '!minor';
  36         const FILTER_BOT = 'bot';
  37         const FILTER_NOT_BOT = '!bot';
  38         const FILTER_ANON = 'anon';
  39         const FILTER_NOT_ANON = '!anon';
  40         const FILTER_PATROLLED = 'patrolled';
  41         const FILTER_NOT_PATROLLED = '!patrolled';
  42         const FILTER_UNREAD = 'unread';
  43         const FILTER_NOT_UNREAD = '!unread';
  44         const FILTER_CHANGED = 'changed';
  45         const FILTER_NOT_CHANGED = '!changed';
  46
  47         const SORT_ASC = 'ASC';
  48         const SORT_DESC = 'DESC';
  49
  50         /**
  51          * @var LoadBalancer
  52          */
  53         private $loadBalancer;
  54
  55         /** @var WatchedItemQueryServiceExtension[]|null */
  56         private $extensions = null;
  57
  58         /**
  59          * @var CommentStore|null */
  60         private $commentStore = null;
  61
  62         public function __construct( LoadBalancer $loadBalancer ) {
  63                 $this->loadBalancer = $loadBalancer;
  64         }
  65
  66         /**
  67          * @return WatchedItemQueryServiceExtension[]
  68          */
  69         private function getExtensions() {
  70                 if ( $this->extensions === null ) {
  71                         $this->extensions = [];
  72                         Hooks::run( 'WatchedItemQueryServiceExtensions', [ &$this->extensions, $this ] );
  73                 }
  74                 return $this->extensions;
  75         }
  76
  77         /**
  78          * @return IDatabase
  79          * @throws MWException
  80          */
  81         private function getConnection() {
  82                 return $this->loadBalancer->getConnectionRef( DB_REPLICA, [ 'watchlist' ] );
  83         }
  84
  85         private function getCommentStore() {
  86                 if ( !$this->commentStore ) {
  87                         $this->commentStore = new CommentStore( 'rc_comment' );
  88                 }
  89                 return $this->commentStore;
  90         }
  91
  92         /**
  93          * @param User $user
  94          * @param array $options Allowed keys:
  95          *        'includeFields'       => string[] RecentChange fields to be included in the result,
  96          *                                 self::INCLUDE_* constants should be used
  97          *        'filters'             => string[] optional filters to narrow down resulted items
  98          *        'namespaceIds'        => int[] optional namespace IDs to filter by
  99          *                                 (defaults to all namespaces)
 100          *        'allRevisions'        => bool return multiple revisions of the same page if true,
 101          *                                 only the most recent if false (default)
 102          *        'rcTypes'             => int[] which types of RecentChanges to include
 103          *                                 (defaults to all types), allowed values: RC_EDIT, RC_NEW,
 104          *                                 RC_LOG, RC_EXTERNAL, RC_CATEGORIZE
 105          *        'onlyByUser'          => string only list changes by a specified user
 106          *        'notByUser'           => string do not incluide changes by a specified user
 107          *        'dir'                 => string in which direction to enumerate, accepted values:
 108          *                                 - DIR_OLDER list newest first
 109          *                                 - DIR_NEWER list oldest first
 110          *        'start'               => string (format accepted by wfTimestamp) requires 'dir' option,
 111          *                                 timestamp to start enumerating from
 112          *        'end'                 => string (format accepted by wfTimestamp) requires 'dir' option,
 113          *                                 timestamp to end enumerating
 114          *        'watchlistOwner'      => User user whose watchlist items should be listed if different
 115          *                                 than the one specified with $user param,
 116          *                                 requires 'watchlistOwnerToken' option
 117          *        'watchlistOwnerToken' => string a watchlist token used to access another user's
 118          *                                 watchlist, used with 'watchlistOwnerToken' option
 119          *        'limit'               => int maximum numbers of items to return
 120          *        'usedInGenerator'     => bool include only RecentChange id field required by the
 121          *                                 generator ('rc_cur_id' or 'rc_this_oldid') if true, or all
 122          *                                 id fields ('rc_cur_id', 'rc_this_oldid', 'rc_last_oldid')
 123          *                                 if false (default)
 124          * @param array|null &$startFrom Continuation value: [ string $rcTimestamp, int $rcId ]
 125          * @return array of pairs ( WatchedItem $watchedItem, string[] $recentChangeInfo ),
 126          *         where $recentChangeInfo contains the following keys:
 127          *         - 'rc_id',
 128          *         - 'rc_namespace',
 129          *         - 'rc_title',
 130          *         - 'rc_timestamp',
 131          *         - 'rc_type',
 132          *         - 'rc_deleted',
 133          *         Additional keys could be added by specifying the 'includeFields' option
 134          */
 135         public function getWatchedItemsWithRecentChangeInfo(
 136                 User $user, array $options = [], &$startFrom = null
 137         ) {
 138                 $options += [
 139                         'includeFields' => [],
 140                         'namespaceIds' => [],
 141                         'filters' => [],
 142                         'allRevisions' => false,
 143                         'usedInGenerator' => false
 144                 ];
 145
 146                 Assert::parameter(
 147                         !isset( $options['rcTypes'] )
 148                                 || !array_diff( $options['rcTypes'], [ RC_EDIT, RC_NEW, RC_LOG, RC_EXTERNAL, RC_CATEGORIZE ] ),
 149                         '$options[\'rcTypes\']',
 150                         'must be an array containing only: RC_EDIT, RC_NEW, RC_LOG, RC_EXTERNAL and/or RC_CATEGORIZE'
 151                 );
 152                 Assert::parameter(
 153                         !isset( $options['dir'] ) || in_array( $options['dir'], [ self::DIR_OLDER, self::DIR_NEWER ] ),
 154                         '$options[\'dir\']',
 155                         'must be DIR_OLDER or DIR_NEWER'
 156                 );
 157                 Assert::parameter(
 158                         !isset( $options['start'] ) && !isset( $options['end'] ) && $startFrom === null
 159                                 || isset( $options['dir'] ),
 160                         '$options[\'dir\']',
 161                         'must be provided when providing the "start" or "end" options or the $startFrom parameter'
 162                 );
 163                 Assert::parameter(
 164                         !isset( $options['startFrom'] ),
 165                         '$options[\'startFrom\']',
 166                         'must not be provided, use $startFrom instead'
 167                 );
 168                 Assert::parameter(
 169                         !isset( $startFrom ) || ( is_array( $startFrom ) && count( $startFrom ) === 2 ),
 170                         '$startFrom',
 171                         'must be a two-element array'
 172                 );
 173                 if ( array_key_exists( 'watchlistOwner', $options ) ) {
 174                         Assert::parameterType(
 175                                 User::class,
 176                                 $options['watchlistOwner'],
 177                                 '$options[\'watchlistOwner\']'
 178                         );
 179                         Assert::parameter(
 180                                 isset( $options['watchlistOwnerToken'] ),
 181                                 '$options[\'watchlistOwnerToken\']',
 182                                 'must be provided when providing watchlistOwner option'
 183                         );
 184                 }
 185
 186                 $db = $this->getConnection();
 187
 188                 $tables = $this->getWatchedItemsWithRCInfoQueryTables( $options );
 189                 $fields = $this->getWatchedItemsWithRCInfoQueryFields( $options );
 190                 $conds = $this->getWatchedItemsWithRCInfoQueryConds( $db, $user, $options );
 191                 $dbOptions = $this->getWatchedItemsWithRCInfoQueryDbOptions( $options );
 192                 $joinConds = $this->getWatchedItemsWithRCInfoQueryJoinConds( $options );
 193
 194                 if ( $startFrom !== null ) {
 195                         $conds[] = $this->getStartFromConds( $db, $options, $startFrom );
 196                 }
 197
 198                 foreach ( $this->getExtensions() as $extension ) {
 199                         $extension->modifyWatchedItemsWithRCInfoQuery(
 200                                 $user, $options, $db,
 201                                 $tables,
 202                                 $fields,
 203                                 $conds,
 204                                 $dbOptions,
 205                                 $joinConds
 206                         );
 207                 }
 208
 209                 $res = $db->select(
 210                         $tables,
 211                         $fields,
 212                         $conds,
 213                         __METHOD__,
 214                         $dbOptions,
 215                         $joinConds
 216                 );
 217
 218                 $limit = isset( $dbOptions['LIMIT'] ) ? $dbOptions['LIMIT'] : INF;
 219                 $items = [];
 220                 $startFrom = null;
 221                 foreach ( $res as $row ) {
 222                         if ( --$limit <= 0 ) {
 223                                 $startFrom = [ $row->rc_timestamp, $row->rc_id ];
 224                                 break;
 225                         }
 226
 227                         $items[] = [
 228                                 new WatchedItem(
 229                                         $user,
 230                                         new TitleValue( (int)$row->rc_namespace, $row->rc_title ),
 231                                         $row->wl_notificationtimestamp
 232                                 ),
 233                                 $this->getRecentChangeFieldsFromRow( $row )
 234                         ];
 235                 }
 236
 237                 foreach ( $this->getExtensions() as $extension ) {
 238                         $extension->modifyWatchedItemsWithRCInfo( $user, $options, $db, $items, $res, $startFrom );
 239                 }
 240
 241                 return $items;
 242         }
 243
 244         /**
 245          * For simple listing of user's watchlist items, see WatchedItemStore::getWatchedItemsForUser
 246          *
 247          * @param User $user
 248          * @param array $options Allowed keys:
 249          *        'sort'         => string optional sorting by namespace ID and title
 250          *                          one of the self::SORT_* constants
 251          *        'namespaceIds' => int[] optional namespace IDs to filter by (defaults to all namespaces)
 252          *        'limit'        => int maximum number of items to return
 253          *        'filter'       => string optional filter, one of the self::FILTER_* contants
 254          *        'from'         => LinkTarget requires 'sort' key, only return items starting from
 255          *                          those related to the link target
 256          *        'until'        => LinkTarget requires 'sort' key, only return items until
 257          *                          those related to the link target
 258          *        'startFrom'    => LinkTarget requires 'sort' key, only return items starting from
 259          *                          those related to the link target, allows to skip some link targets
 260          *                          specified using the form option
 261          * @return WatchedItem[]
 262          */
 263         public function getWatchedItemsForUser( User $user, array $options = [] ) {
 264                 if ( $user->isAnon() ) {
 265                         // TODO: should this just return an empty array or rather complain loud at this point
 266                         // as e.g. ApiBase::getWatchlistUser does?
 267                         return [];
 268                 }
 269
 270                 $options += [ 'namespaceIds' => [] ];
 271
 272                 Assert::parameter(
 273                         !isset( $options['sort'] ) || in_array( $options['sort'], [ self::SORT_ASC, self::SORT_DESC ] ),
 274                         '$options[\'sort\']',
 275                         'must be SORT_ASC or SORT_DESC'
 276                 );
 277                 Assert::parameter(
 278                         !isset( $options['filter'] ) || in_array(
 279                                 $options['filter'], [ self::FILTER_CHANGED, self::FILTER_NOT_CHANGED ]
 280                         ),
 281                         '$options[\'filter\']',
 282                         'must be FILTER_CHANGED or FILTER_NOT_CHANGED'
 283                 );
 284                 Assert::parameter(
 285                         !isset( $options['from'] ) && !isset( $options['until'] ) && !isset( $options['startFrom'] )
 286                         || isset( $options['sort'] ),
 287                         '$options[\'sort\']',
 288                         'must be provided if any of "from", "until", "startFrom" options is provided'
 289                 );
 290
 291                 $db = $this->getConnection();
 292
 293                 $conds = $this->getWatchedItemsForUserQueryConds( $db, $user, $options );
 294                 $dbOptions = $this->getWatchedItemsForUserQueryDbOptions( $options );
 295
 296                 $res = $db->select(
 297                         'watchlist',
 298                         [ 'wl_namespace', 'wl_title', 'wl_notificationtimestamp' ],
 299                         $conds,
 300                         __METHOD__,
 301                         $dbOptions
 302                 );
 303
 304                 $watchedItems = [];
 305                 foreach ( $res as $row ) {
 306                         // todo these could all be cached at some point?
 307                         $watchedItems[] = new WatchedItem(
 308                                 $user,
 309                                 new TitleValue( (int)$row->wl_namespace, $row->wl_title ),
 310                                 $row->wl_notificationtimestamp
 311                         );
 312                 }
 313
 314                 return $watchedItems;
 315         }
 316
 317         private function getRecentChangeFieldsFromRow( stdClass $row ) {
 318                 // This can be simplified to single array_filter call filtering by key value,
 319                 // once we stop supporting PHP 5.5
 320                 $allFields = get_object_vars( $row );
 321                 $rcKeys = array_filter(
 322                         array_keys( $allFields ),
 323                         function ( $key ) {
 324                                 return substr( $key, 0, 3 ) === 'rc_';
 325                         }
 326                 );
 327                 return array_intersect_key( $allFields, array_flip( $rcKeys ) );
 328         }
 329
 330         private function getWatchedItemsWithRCInfoQueryTables( array $options ) {
 331                 $tables = [ 'recentchanges', 'watchlist' ];
 332                 if ( !$options['allRevisions'] ) {
 333                         $tables[] = 'page';
 334                 }
 335                 if ( in_array( self::INCLUDE_COMMENT, $options['includeFields'] ) ) {
 336                         $tables += $this->getCommentStore()->getJoin()['tables'];
 337                 }
 338                 return $tables;
 339         }
 340
 341         private function getWatchedItemsWithRCInfoQueryFields( array $options ) {
 342                 $fields = [
 343                         'rc_id',
 344                         'rc_namespace',
 345                         'rc_title',
 346                         'rc_timestamp',
 347                         'rc_type',
 348                         'rc_deleted',
 349                         'wl_notificationtimestamp'
 350                 ];
 351
 352                 $rcIdFields = [
 353                         'rc_cur_id',
 354                         'rc_this_oldid',
 355                         'rc_last_oldid',
 356                 ];
 357                 if ( $options['usedInGenerator'] ) {
 358                         if ( $options['allRevisions'] ) {
 359                                 $rcIdFields = [ 'rc_this_oldid' ];
 360                         } else {
 361                                 $rcIdFields = [ 'rc_cur_id' ];
 362                         }
 363                 }
 364                 $fields = array_merge( $fields, $rcIdFields );
 365
 366                 if ( in_array( self::INCLUDE_FLAGS, $options['includeFields'] ) ) {
 367                         $fields = array_merge( $fields, [ 'rc_type', 'rc_minor', 'rc_bot' ] );
 368                 }
 369                 if ( in_array( self::INCLUDE_USER, $options['includeFields'] ) ) {
 370                         $fields[] = 'rc_user_text';
 371                 }
 372                 if ( in_array( self::INCLUDE_USER_ID, $options['includeFields'] ) ) {
 373                         $fields[] = 'rc_user';
 374                 }
 375                 if ( in_array( self::INCLUDE_COMMENT, $options['includeFields'] ) ) {
 376                         $fields += $this->getCommentStore()->getJoin()['fields'];
 377                 }
 378                 if ( in_array( self::INCLUDE_PATROL_INFO, $options['includeFields'] ) ) {
 379                         $fields = array_merge( $fields, [ 'rc_patrolled', 'rc_log_type' ] );
 380                 }
 381                 if ( in_array( self::INCLUDE_SIZES, $options['includeFields'] ) ) {
 382                         $fields = array_merge( $fields, [ 'rc_old_len', 'rc_new_len' ] );
 383                 }
 384                 if ( in_array( self::INCLUDE_LOG_INFO, $options['includeFields'] ) ) {
 385                         $fields = array_merge( $fields, [ 'rc_logid', 'rc_log_type', 'rc_log_action', 'rc_params' ] );
 386                 }
 387
 388                 return $fields;
 389         }
 390
 391         private function getWatchedItemsWithRCInfoQueryConds(
 392                 IDatabase $db,
 393                 User $user,
 394                 array $options
 395         ) {
 396                 $watchlistOwnerId = $this->getWatchlistOwnerId( $user, $options );
 397                 $conds = [ 'wl_user' => $watchlistOwnerId ];
 398
 399                 if ( !$options['allRevisions'] ) {
 400                         $conds[] = $db->makeList(
 401                                 [ 'rc_this_oldid=page_latest', 'rc_type=' . RC_LOG ],
 402                                 LIST_OR
 403                         );
 404                 }
 405
 406                 if ( $options['namespaceIds'] ) {
 407                         $conds['wl_namespace'] = array_map( 'intval', $options['namespaceIds'] );
 408                 }
 409
 410                 if ( array_key_exists( 'rcTypes', $options ) ) {
 411                         $conds['rc_type'] = array_map( 'intval', $options['rcTypes'] );
 412                 }
 413
 414                 $conds = array_merge(
 415                         $conds,
 416                         $this->getWatchedItemsWithRCInfoQueryFilterConds( $user, $options )
 417                 );
 418
 419                 $conds = array_merge( $conds, $this->getStartEndConds( $db, $options ) );
 420
 421                 if ( !isset( $options['start'] ) && !isset( $options['end'] ) ) {
 422                         if ( $db->getType() === 'mysql' ) {
 423                                 // This is an index optimization for mysql
 424                                 $conds[] = 'rc_timestamp > ' . $db->addQuotes( '' );
 425                         }
 426                 }
 427
 428                 $conds = array_merge( $conds, $this->getUserRelatedConds( $db, $user, $options ) );
 429
 430                 $deletedPageLogCond = $this->getExtraDeletedPageLogEntryRelatedCond( $db, $user );
 431                 if ( $deletedPageLogCond ) {
 432                         $conds[] = $deletedPageLogCond;
 433                 }
 434
 435                 return $conds;
 436         }
 437
 438         private function getWatchlistOwnerId( User $user, array $options ) {
 439                 if ( array_key_exists( 'watchlistOwner', $options ) ) {
 440                         /** @var User $watchlistOwner */
 441                         $watchlistOwner = $options['watchlistOwner'];
 442                         $ownersToken = $watchlistOwner->getOption( 'watchlisttoken' );
 443                         $token = $options['watchlistOwnerToken'];
 444                         if ( $ownersToken == '' || !hash_equals( $ownersToken, $token ) ) {
 445                                 throw ApiUsageException::newWithMessage( null, 'apierror-bad-watchlist-token', 'bad_wltoken' );
 446                         }
 447                         return $watchlistOwner->getId();
 448                 }
 449                 return $user->getId();
 450         }
 451
 452         private function getWatchedItemsWithRCInfoQueryFilterConds( User $user, array $options ) {
 453                 $conds = [];
 454
 455                 if ( in_array( self::FILTER_MINOR, $options['filters'] ) ) {
 456                         $conds[] = 'rc_minor != 0';
 457                 } elseif ( in_array( self::FILTER_NOT_MINOR, $options['filters'] ) ) {
 458                         $conds[] = 'rc_minor = 0';
 459                 }
 460
 461                 if ( in_array( self::FILTER_BOT, $options['filters'] ) ) {
 462                         $conds[] = 'rc_bot != 0';
 463                 } elseif ( in_array( self::FILTER_NOT_BOT, $options['filters'] ) ) {
 464                         $conds[] = 'rc_bot = 0';
 465                 }
 466
 467                 if ( in_array( self::FILTER_ANON, $options['filters'] ) ) {
 468                         $conds[] = 'rc_user = 0';
 469                 } elseif ( in_array( self::FILTER_NOT_ANON, $options['filters'] ) ) {
 470                         $conds[] = 'rc_user != 0';
 471                 }
 472
 473                 if ( $user->useRCPatrol() || $user->useNPPatrol() ) {
 474                         // TODO: not sure if this should simply ignore patrolled filters if user does not have the patrol
 475                         // right, or maybe rather fail loud at this point, same as e.g. ApiQueryWatchlist does?
 476                         if ( in_array( self::FILTER_PATROLLED, $options['filters'] ) ) {
 477                                 $conds[] = 'rc_patrolled != 0';
 478                         } elseif ( in_array( self::FILTER_NOT_PATROLLED, $options['filters'] ) ) {
 479                                 $conds[] = 'rc_patrolled = 0';
 480                         }
 481                 }
 482
 483                 if ( in_array( self::FILTER_UNREAD, $options['filters'] ) ) {
 484                         $conds[] = 'rc_timestamp >= wl_notificationtimestamp';
 485                 } elseif ( in_array( self::FILTER_NOT_UNREAD, $options['filters'] ) ) {
 486                         // TODO: should this be changed to use Database::makeList?
 487                         $conds[] = 'wl_notificationtimestamp IS NULL OR rc_timestamp < wl_notificationtimestamp';
 488                 }
 489
 490                 return $conds;
 491         }
 492
 493         private function getStartEndConds( IDatabase $db, array $options ) {
 494                 if ( !isset( $options['start'] ) && !isset( $options['end'] ) ) {
 495                         return [];
 496                 }
 497
 498                 $conds = [];
 499
 500                 if ( isset( $options['start'] ) ) {
 501                         $after = $options['dir'] === self::DIR_OLDER ? '<=' : '>=';
 502                         $conds[] = 'rc_timestamp ' . $after . ' ' .
 503                                 $db->addQuotes( $db->timestamp( $options['start'] ) );
 504                 }
 505                 if ( isset( $options['end'] ) ) {
 506                         $before = $options['dir'] === self::DIR_OLDER ? '>=' : '<=';
 507                         $conds[] = 'rc_timestamp ' . $before . ' ' .
 508                                 $db->addQuotes( $db->timestamp( $options['end'] ) );
 509                 }
 510
 511                 return $conds;
 512         }
 513
 514         private function getUserRelatedConds( IDatabase $db, User $user, array $options ) {
 515                 if ( !array_key_exists( 'onlyByUser', $options ) && !array_key_exists( 'notByUser', $options ) ) {
 516                         return [];
 517                 }
 518
 519                 $conds = [];
 520
 521                 if ( array_key_exists( 'onlyByUser', $options ) ) {
 522                         $conds['rc_user_text'] = $options['onlyByUser'];
 523                 } elseif ( array_key_exists( 'notByUser', $options ) ) {
 524                         $conds[] = 'rc_user_text != ' . $db->addQuotes( $options['notByUser'] );
 525                 }
 526
 527                 // Avoid brute force searches (T19342)
 528                 $bitmask = 0;
 529                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
 530                         $bitmask = Revision::DELETED_USER;
 531                 } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 532                         $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 533                 }
 534                 if ( $bitmask ) {
 535                         $conds[] = $db->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask";
 536                 }
 537
 538                 return $conds;
 539         }
 540
 541         private function getExtraDeletedPageLogEntryRelatedCond( IDatabase $db, User $user ) {
 542                 // LogPage::DELETED_ACTION hides the affected page, too. So hide those
 543                 // entirely from the watchlist, or someone could guess the title.
 544                 $bitmask = 0;
 545                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
 546                         $bitmask = LogPage::DELETED_ACTION;
 547                 } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 548                         $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
 549                 }
 550                 if ( $bitmask ) {
 551                         return $db->makeList( [
 552                                 'rc_type != ' . RC_LOG,
 553                                 $db->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
 554                         ], LIST_OR );
 555                 }
 556                 return '';
 557         }
 558
 559         private function getStartFromConds( IDatabase $db, array $options, array $startFrom ) {
 560                 $op = $options['dir'] === self::DIR_OLDER ? '<' : '>';
 561                 list( $rcTimestamp, $rcId ) = $startFrom;
 562                 $rcTimestamp = $db->addQuotes( $db->timestamp( $rcTimestamp ) );
 563                 $rcId = (int)$rcId;
 564                 return $db->makeList(
 565                         [
 566                                 "rc_timestamp $op $rcTimestamp",
 567                                 $db->makeList(
 568                                         [
 569                                                 "rc_timestamp = $rcTimestamp",
 570                                                 "rc_id $op= $rcId"
 571                                         ],
 572                                         LIST_AND
 573                                 )
 574                         ],
 575                         LIST_OR
 576                 );
 577         }
 578
 579         private function getWatchedItemsForUserQueryConds( IDatabase $db, User $user, array $options ) {
 580                 $conds = [ 'wl_user' => $user->getId() ];
 581                 if ( $options['namespaceIds'] ) {
 582                         $conds['wl_namespace'] = array_map( 'intval', $options['namespaceIds'] );
 583                 }
 584                 if ( isset( $options['filter'] ) ) {
 585                         $filter = $options['filter'];
 586                         if ( $filter === self::FILTER_CHANGED ) {
 587                                 $conds[] = 'wl_notificationtimestamp IS NOT NULL';
 588                         } else {
 589                                 $conds[] = 'wl_notificationtimestamp IS NULL';
 590                         }
 591                 }
 592
 593                 if ( isset( $options['from'] ) ) {
 594                         $op = $options['sort'] === self::SORT_ASC ? '>' : '<';
 595                         $conds[] = $this->getFromUntilTargetConds( $db, $options['from'], $op );
 596                 }
 597                 if ( isset( $options['until'] ) ) {
 598                         $op = $options['sort'] === self::SORT_ASC ? '<' : '>';
 599                         $conds[] = $this->getFromUntilTargetConds( $db, $options['until'], $op );
 600                 }
 601                 if ( isset( $options['startFrom'] ) ) {
 602                         $op = $options['sort'] === self::SORT_ASC ? '>' : '<';
 603                         $conds[] = $this->getFromUntilTargetConds( $db, $options['startFrom'], $op );
 604                 }
 605
 606                 return $conds;
 607         }
 608
 609         /**
 610          * Creates a query condition part for getting only items before or after the given link target
 611          * (while ordering using $sort mode)
 612          *
 613          * @param IDatabase $db
 614          * @param LinkTarget $target
 615          * @param string $op comparison operator to use in the conditions
 616          * @return string
 617          */
 618         private function getFromUntilTargetConds( IDatabase $db, LinkTarget $target, $op ) {
 619                 return $db->makeList(
 620                         [
 621                                 "wl_namespace $op " . $target->getNamespace(),
 622                                 $db->makeList(
 623                                         [
 624                                                 'wl_namespace = ' . $target->getNamespace(),
 625                                                 "wl_title $op= " . $db->addQuotes( $target->getDBkey() )
 626                                         ],
 627                                         LIST_AND
 628                                 )
 629                         ],
 630                         LIST_OR
 631                 );
 632         }
 633
 634         private function getWatchedItemsWithRCInfoQueryDbOptions( array $options ) {
 635                 $dbOptions = [];
 636
 637                 if ( array_key_exists( 'dir', $options ) ) {
 638                         $sort = $options['dir'] === self::DIR_OLDER ? ' DESC' : '';
 639                         $dbOptions['ORDER BY'] = [ 'rc_timestamp' . $sort, 'rc_id' . $sort ];
 640                 }
 641
 642                 if ( array_key_exists( 'limit', $options ) ) {
 643                         $dbOptions['LIMIT'] = (int)$options['limit'] + 1;
 644                 }
 645
 646                 return $dbOptions;
 647         }
 648
 649         private function getWatchedItemsForUserQueryDbOptions( array $options ) {
 650                 $dbOptions = [];
 651                 if ( array_key_exists( 'sort', $options ) ) {
 652                         $dbOptions['ORDER BY'] = [
 653                                 "wl_namespace {$options['sort']}",
 654                                 "wl_title {$options['sort']}"
 655                         ];
 656                         if ( count( $options['namespaceIds'] ) === 1 ) {
 657                                 $dbOptions['ORDER BY'] = "wl_title {$options['sort']}";
 658                         }
 659                 }
 660                 if ( array_key_exists( 'limit', $options ) ) {
 661                         $dbOptions['LIMIT'] = (int)$options['limit'];
 662                 }
 663                 return $dbOptions;
 664         }
 665
 666         private function getWatchedItemsWithRCInfoQueryJoinConds( array $options ) {
 667                 $joinConds = [
 668                         'watchlist' => [ 'INNER JOIN',
 669                                 [
 670                                         'wl_namespace=rc_namespace',
 671                                         'wl_title=rc_title'
 672                                 ]
 673                         ]
 674                 ];
 675                 if ( !$options['allRevisions'] ) {
 676                         $joinConds['page'] = [ 'LEFT JOIN', 'rc_cur_id=page_id' ];
 677                 }
 678                 if ( in_array( self::INCLUDE_COMMENT, $options['includeFields'] ) ) {
 679                         $joinConds += $this->getCommentStore()->getJoin()['joins'];
 680                 }
 681                 return $joinConds;
 682         }
 683
 684 }